add sample data

mdns-udp-capturer.js

@@ -0,0 +1,57 @@
+'use strict';
+
+// pass a terminal arg
+var type = process.argv[2] || 'unknown';
+var count = parseInt(process.argv[3]) || 0;
+if (!type) {
+  console.error("Usage: node aj-listener.js <type> [count]");
+  console.error("Example: node aj-listener.js _service 0");
+  process.exit(1);
+}
+
+var PromiseA = require('bluebird');
+var fs = PromiseA.promisifyAll(require('fs'));
+var dgram = require('dgram');
+var server = dgram.createSocket({
+  type: 'udp4'
+, reuseAddr: true
+});
+
+
+var handlers = {};
+handlers.onError = function (err) {
+    console.error("error:", err.stack);
+    server.close();
+};
+handlers.onMessage = function (buffer) {
+  var name;
+
+  if (!count) {
+    name = type + '-' + count + '.mdns.bin';
+  }
+  else {
+    // probably the same device name responding
+    name = type + '-' + buffer.length + '.mdns.bin';
+  }
+
+  fs.writeFileAsync(name, buffer).then(function () {
+    console.log('wrote ' + buffer.length + ' bytes to ' + name);
+  });
+};
+handlers.onListening = function () {
+  /*jshint validthis:true*/
+  var server = this;
+  console.log(server.address());
+
+  server.setBroadcast(true);
+  server.addMembership('224.0.0.251');
+};
+
+
+server.on('error', handlers.onError);
+server.on('message', handlers.onMessage);
+server.on('listening', handlers.onListening);
+
+// 53 dns
+// 5353 mdns
+server.bind(5353);

samples/README.md

@@ -0,0 +1,12 @@
+These samples were captured by running a generic udp listener and then running dig to create a query.
+
+Most likely the 0th samples are the query from dig and the other immediately numbered samples are responses to that query...
+
+However, devices broadcast mDNS packets pretty much at random, so there'll be some other goodies in there too.
+
+```
+dig @224.0.0.251 -p 5353 -t ptr _services._dns-sd._udp.local
+dig @224.0.0.251 -p 5353 -t ptr _ssh._tcp.local
+dig @224.0.0.251 -p 5353 -t ptr _sftp-ssh._tcp.local
+dig @224.0.0.251 -p 5353 -t A bowie._sftp-ssh._tcp.local
+```